Class: PopulateMe::GridFSAttachment

Inherits:
Attachment show all
Defined in:
lib/populate_me/grid_fs_attachment.rb

Instance Attribute Summary

Attributes inherited from Attachment

#document, #field

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Attachment

#attachee_prefix, #create, #create_variations, #delete, #delete_all, #ensure_local_path, #field_filename, #field_options, #field_value, inherited, #initialize, #location, #location_for_filename, set, #settings, #variations

Constructor Details

This class inherits a constructor from PopulateMe::Attachment

Class Method Details

.ensure_db ⇒ Object

Raises:



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# File 'lib/populate_me/grid_fs_attachment.rb', line 78

def ensure_db
  raise MissingMongoDBError, "Attachment class #{self.name} does not have a Mongo database." if settings.db.nil?
end

.middleware ⇒ Object 



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# File 'lib/populate_me/grid_fs_attachment.rb', line 82

def middleware
  Rack::GridServe
end

.middleware_options ⇒ Object 



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# File 'lib/populate_me/grid_fs_attachment.rb', line 86

def middleware_options
  [
    {
      prefix: settings.url_prefix.dup.gsub(/^\/|\/$/,''), 
      db: settings.db,
      # lookup: :path
    }
  ]
end

Instance Method Details

#deletable?(variation_name = :original) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/populate_me/grid_fs_attachment.rb', line 66

def deletable? variation_name=:original
  !WebUtils.blank? self.field_filename(variation_name)
  # Fine since deleting a non-existent file does not raise an error in mongo
end

#location_root ⇒ Object

Attachee_prefix is moved on field_value for gridfs



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# File 'lib/populate_me/grid_fs_attachment.rb', line 19

def location_root
  File.join(
    settings.root, 
    settings.url_prefix
  )
end

#next_available_filename(filename) ⇒ Object 



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# File 'lib/populate_me/grid_fs_attachment.rb', line 26

def next_available_filename filename
  ext = File.extname(filename)
  base = "#{attachee_prefix}/#{File.basename(filename,ext)}"
  i = 0
  loop do
    suffix = i==0 ? '' : "-#{i}"
    potential_filename = [base,suffix,ext].join
    if settings.db.fs.find(filename: potential_filename).count>0
      i += 1
    else
      filename = potential_filename
      break
    end
  end
  filename
end

#perform_create(hash) ⇒ Object 



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# File 'lib/populate_me/grid_fs_attachment.rb', line 43

def perform_create hash
  if hash[:variation].nil?
    fn = next_available_filename(hash[:filename])
    file = hash[:tempfile]
    type = hash[:type]
  else
    fn = WebUtils.filename_variation hash[:future_field_value], hash[:variation].name, hash[:variation].ext
    file = File.open(hash[:variation_path])
    type = Rack::Mime.mime_type ".#{hash[:variation].ext}"
  end
  settings.db.fs.upload_from_stream(
    fn,
    file, {
      content_type: type,
      metadata: {
        parent_collection: (self.document.class.respond_to?(:collection) ? self.document.class.collection.name : self.attachee_prefix),
      }
    }
  )
  file.close unless hash[:variation].nil?
  fn
end

#perform_delete(variation_name = :original) ⇒ Object 



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# File 'lib/populate_me/grid_fs_attachment.rb', line 71

def perform_delete variation_name=:original
  gridfile = settings.db.fs.find(filename: self.field_filename(variation_name)).first
  settings.db.fs.delete(gridfile['_id']) unless gridfile.nil?
end

#url(variation_name = :original) ⇒ Object

Attachee_prefix is moved on field_value for gridfs



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# File 'lib/populate_me/grid_fs_attachment.rb', line 14

def url variation_name=:original
  return nil if WebUtils.blank?(self.field_filename(variation_name))
  "#{settings.url_prefix.sub(/\/$/,'')}/#{self.field_filename(variation_name)}"
end